I'm at week 9 now

Week 9 - 271.2. The last few weeks have been sorta frustrating. I keep losing and gaining the same few pounds. I am not sure what is going on. I don't know if my body is just realizing what I am doing and it is saying "hey, wait a minute, I want to keep this fat around in case you run out of food" or what. Even without the scale going down, I am not discouraged and I am not going to give up. That is one thing about the Dukan diet I really appreciate, it is easy enough that I want to keep going. Hopefully by next week my body will have decided it's time release some more weight. Hmm... I bet exercising might help. :)